arch/powerpc/kvm/powerpc.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License, version 2, as
   4  * published by the Free Software Foundation.
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9  * GNU General Public License for more details.
  10  *
  11  * You should have received a copy of the GNU General Public License
  12  * along with this program; if not, write to the Free Software
  13  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  14  *
  15  * Copyright IBM Corp. 2007
  16  *
  17  * Authors: Hollis Blanchard <hollisb@us.ibm.com>
  18  *          Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
  19  */
  20
  21 #include <linux/errno.h>
  22 #include <linux/err.h>
  23 #include <linux/kvm_host.h>
  24 #include <linux/module.h>
  25 #include <linux/vmalloc.h>
  26 #include <linux/fs.h>
  27 #include <asm/cputable.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/kvm_ppc.h>
  30 #include <asm/tlbflush.h>
  31 #include "timing.h"
  32 #include "../mm/mmu_decl.h"
  33
  34 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
  35 {
  36         return gfn;
  37 }
  38
  39 int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
  40 {
  41         return !!(v->arch.pending_exceptions);
  42 }
  43
  44 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
  45 {
  46         return !(v->arch.msr & MSR_WE);
  47 }
  48
  49
  50 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
  51 {
  52         enum emulation_result er;
  53         int r;
  54
  55         er = kvmppc_emulate_instruction(run, vcpu);
  56         switch (er) {
  57         case EMULATE_DONE:
  58                 /* Future optimization: only reload non-volatiles if they were
  59                  * actually modified. */
  60                 r = RESUME_GUEST_NV;
  61                 break;
  62         case EMULATE_DO_MMIO:
  63                 run->exit_reason = KVM_EXIT_MMIO;
  64                 /* We must reload nonvolatiles because "update" load/store
  65                  * instructions modify register state. */
  66                 /* Future optimization: only reload non-volatiles if they were
  67                  * actually modified. */
  68                 r = RESUME_HOST_NV;
  69                 break;
  70         case EMULATE_FAIL:
  71                 /* XXX Deliver Program interrupt to guest. */
  72                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
  73                        vcpu->arch.last_inst);
  74                 r = RESUME_HOST;
  75                 break;
  76         default:
  77                 BUG();
  78         }
  79
  80         return r;
  81 }
  82
  83 void kvm_arch_hardware_enable(void *garbage)
  84 {
  85 }
  86
  87 void kvm_arch_hardware_disable(void *garbage)
  88 {
  89 }
  90
  91 int kvm_arch_hardware_setup(void)
  92 {
  93         return 0;
  94 }
  95
  96 void kvm_arch_hardware_unsetup(void)
  97 {
  98 }
  99
 100 void kvm_arch_check_processor_compat(void *rtn)
 101 {
 102         *(int *)rtn = kvmppc_core_check_processor_compat();
 103 }
 104
 105 struct kvm *kvm_arch_create_vm(void)
 106 {
 107         struct kvm *kvm;
 108
 109         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
 110         if (!kvm)
 111                 return ERR_PTR(-ENOMEM);
 112
 113         return kvm;
 114 }
 115
 116 static void kvmppc_free_vcpus(struct kvm *kvm)
 117 {
 118         unsigned int i;
 119
 120         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 121                 if (kvm->vcpus[i]) {
 122                         kvm_arch_vcpu_free(kvm->vcpus[i]);
 123                         kvm->vcpus[i] = NULL;
 124                 }
 125         }
 126 }
 127
 128 void kvm_arch_destroy_vm(struct kvm *kvm)
 129 {
 130         kvmppc_free_vcpus(kvm);
 131         kvm_free_physmem(kvm);
 132         kfree(kvm);
 133 }
 134
 135 int kvm_dev_ioctl_check_extension(long ext)
 136 {
 137         int r;
 138
 139         switch (ext) {
 140         case KVM_CAP_COALESCED_MMIO:
 141                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 142                 break;
 143         default:
 144                 r = 0;
 145                 break;
 146         }
 147         return r;
 148
 149 }
 150
 151 long kvm_arch_dev_ioctl(struct file *filp,
 152                         unsigned int ioctl, unsigned long arg)
 153 {
 154         return -EINVAL;
 155 }
 156
 157 int kvm_arch_set_memory_region(struct kvm *kvm,
 158                                struct kvm_userspace_memory_region *mem,
 159                                struct kvm_memory_slot old,
 160                                int user_alloc)
 161 {
 162         return 0;
 163 }
 164
 165 void kvm_arch_flush_shadow(struct kvm *kvm)
 166 {
 167 }
 168
 169 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 170 {
 171         struct kvm_vcpu *vcpu;
 172         vcpu = kvmppc_core_vcpu_create(kvm, id);
 173         kvmppc_create_vcpu_debugfs(vcpu, id);
 174         return vcpu;
 175 }
 176
 177 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 178 {
 179         kvmppc_remove_vcpu_debugfs(vcpu);
 180         kvmppc_core_vcpu_free(vcpu);
 181 }
 182
 183 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 184 {
 185         kvm_arch_vcpu_free(vcpu);
 186 }
 187
 188 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 189 {
 190         return kvmppc_core_pending_dec(vcpu);
 191 }
 192
 193 static void kvmppc_decrementer_func(unsigned long data)
 194 {
 195         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 196
 197         kvmppc_core_queue_dec(vcpu);
 198
 199         if (waitqueue_active(&vcpu->wq)) {
 200                 wake_up_interruptible(&vcpu->wq);
 201                 vcpu->stat.halt_wakeup++;
 202         }
 203 }
 204
 205 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 206 {
 207         setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
 208                     (unsigned long)vcpu);
 209
 210         return 0;
 211 }
 212
 213 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 214 {
 215         kvmppc_core_destroy_mmu(vcpu);
 216 }
 217
 218 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 219 {
 220         if (vcpu->guest_debug.enabled)
 221                 kvmppc_core_load_guest_debugstate(vcpu);
 222
 223         kvmppc_core_vcpu_load(vcpu, cpu);
 224 }
 225
 226 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 227 {
 228         if (vcpu->guest_debug.enabled)
 229                 kvmppc_core_load_host_debugstate(vcpu);
 230
 231         /* Don't leave guest TLB entries resident when being de-scheduled. */
 232         /* XXX It would be nice to differentiate between heavyweight exit and
 233          * sched_out here, since we could avoid the TLB flush for heavyweight
 234          * exits. */
 235         _tlbil_all();
 236         kvmppc_core_vcpu_put(vcpu);
 237 }
 238
 239 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
 240                                     struct kvm_debug_guest *dbg)
 241 {
 242         int i;
 243
 244         vcpu->guest_debug.enabled = dbg->enabled;
 245         if (vcpu->guest_debug.enabled) {
 246                 for (i=0; i < ARRAY_SIZE(vcpu->guest_debug.bp); i++) {
 247                         if (dbg->breakpoints[i].enabled)
 248                                 vcpu->guest_debug.bp[i] = dbg->breakpoints[i].address;
 249                         else
 250                                 vcpu->guest_debug.bp[i] = 0;
 251                 }
 252         }
 253
 254         return 0;
 255 }
 256
 257 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 258                                      struct kvm_run *run)
 259 {
 260         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 261         *gpr = run->dcr.data;
 262 }
 263
 264 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 265                                       struct kvm_run *run)
 266 {
 267         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 268
 269         if (run->mmio.len > sizeof(*gpr)) {
 270                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 271                 return;
 272         }
 273
 274         if (vcpu->arch.mmio_is_bigendian) {
 275                 switch (run->mmio.len) {
 276                 case 4: *gpr = *(u32 *)run->mmio.data; break;
 277                 case 2: *gpr = *(u16 *)run->mmio.data; break;
 278                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 279                 }
 280         } else {
 281                 /* Convert BE data from userland back to LE. */
 282                 switch (run->mmio.len) {
 283                 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
 284                 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
 285                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 286                 }
 287         }
 288 }
 289
 290 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 291                        unsigned int rt, unsigned int bytes, int is_bigendian)
 292 {
 293         if (bytes > sizeof(run->mmio.data)) {
 294                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 295                        run->mmio.len);
 296         }
 297
 298         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 299         run->mmio.len = bytes;
 300         run->mmio.is_write = 0;
 301
 302         vcpu->arch.io_gpr = rt;
 303         vcpu->arch.mmio_is_bigendian = is_bigendian;
 304         vcpu->mmio_needed = 1;
 305         vcpu->mmio_is_write = 0;
 306
 307         return EMULATE_DO_MMIO;
 308 }
 309
 310 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 311                         u32 val, unsigned int bytes, int is_bigendian)
 312 {
 313         void *data = run->mmio.data;
 314
 315         if (bytes > sizeof(run->mmio.data)) {
 316                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 317                        run->mmio.len);
 318         }
 319
 320         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 321         run->mmio.len = bytes;
 322         run->mmio.is_write = 1;
 323         vcpu->mmio_needed = 1;
 324         vcpu->mmio_is_write = 1;
 325
 326         /* Store the value at the lowest bytes in 'data'. */
 327         if (is_bigendian) {
 328                 switch (bytes) {
 329                 case 4: *(u32 *)data = val; break;
 330                 case 2: *(u16 *)data = val; break;
 331                 case 1: *(u8  *)data = val; break;
 332                 }
 333         } else {
 334                 /* Store LE value into 'data'. */
 335                 switch (bytes) {
 336                 case 4: st_le32(data, val); break;
 337                 case 2: st_le16(data, val); break;
 338                 case 1: *(u8 *)data = val; break;
 339                 }
 340         }
 341
 342         return EMULATE_DO_MMIO;
 343 }
 344
 345 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 346 {
 347         int r;
 348         sigset_t sigsaved;
 349
 350         vcpu_load(vcpu);
 351
 352         if (vcpu->sigset_active)
 353                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 354
 355         if (vcpu->mmio_needed) {
 356                 if (!vcpu->mmio_is_write)
 357                         kvmppc_complete_mmio_load(vcpu, run);
 358                 vcpu->mmio_needed = 0;
 359         } else if (vcpu->arch.dcr_needed) {
 360                 if (!vcpu->arch.dcr_is_write)
 361                         kvmppc_complete_dcr_load(vcpu, run);
 362                 vcpu->arch.dcr_needed = 0;
 363         }
 364
 365         kvmppc_core_deliver_interrupts(vcpu);
 366
 367         local_irq_disable();
 368         kvm_guest_enter();
 369         r = __kvmppc_vcpu_run(run, vcpu);
 370         kvm_guest_exit();
 371         local_irq_enable();
 372
 373         if (vcpu->sigset_active)
 374                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 375
 376         vcpu_put(vcpu);
 377
 378         return r;
 379 }
 380
 381 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 382 {
 383         kvmppc_core_queue_external(vcpu, irq);
 384
 385         if (waitqueue_active(&vcpu->wq)) {
 386                 wake_up_interruptible(&vcpu->wq);
 387                 vcpu->stat.halt_wakeup++;
 388         }
 389
 390         return 0;
 391 }
 392
 393 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 394                                     struct kvm_mp_state *mp_state)
 395 {
 396         return -EINVAL;
 397 }
 398
 399 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 400                                     struct kvm_mp_state *mp_state)
 401 {
 402         return -EINVAL;
 403 }
 404
 405 long kvm_arch_vcpu_ioctl(struct file *filp,
 406                          unsigned int ioctl, unsigned long arg)
 407 {
 408         struct kvm_vcpu *vcpu = filp->private_data;
 409         void __user *argp = (void __user *)arg;
 410         long r;
 411
 412         switch (ioctl) {
 413         case KVM_INTERRUPT: {
 414                 struct kvm_interrupt irq;
 415                 r = -EFAULT;
 416                 if (copy_from_user(&irq, argp, sizeof(irq)))
 417                         goto out;
 418                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 419                 break;
 420         }
 421         default:
 422                 r = -EINVAL;
 423         }
 424
 425 out:
 426         return r;
 427 }
 428
 429 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 430 {
 431         return -ENOTSUPP;
 432 }
 433
 434 long kvm_arch_vm_ioctl(struct file *filp,
 435                        unsigned int ioctl, unsigned long arg)
 436 {
 437         long r;
 438
 439         switch (ioctl) {
 440         default:
 441                 r = -EINVAL;
 442         }
 443
 444         return r;
 445 }
 446
 447 int kvm_arch_init(void *opaque)
 448 {
 449         return 0;
 450 }
 451
 452 void kvm_arch_exit(void)
 453 {
 454 }